Support using TrackedCallbacks as hints to determine the handling thread of resource reply messages

ppapi/proxy/file_chooser_resource_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/message_loop/message_loop.h"
 #include "ppapi/c/dev/ppb_file_chooser_dev.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/ppb_file_ref.h"
 #include "ppapi/proxy/file_chooser_resource.h"
 #include "ppapi/proxy/locking_resource_releaser.h"
+#include "ppapi/proxy/plugin_message_filter.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/proxy/ppapi_proxy_test.h"
 #include "ppapi/shared_impl/proxy_lock.h"
 #include "ppapi/shared_impl/scoped_pp_var.h"
 #include "ppapi/shared_impl/var.h"
 #include "ppapi/thunk/thunk.h"
 
 namespace ppapi {
 namespace proxy {
 
@@ skipping 73 matching lines @@
   // Synthesize a response with one file ref in it. Note that it must have a
   // pending_host_resource_id set. Since there isn't actually a host, this can
   // be whatever we want.
   std::vector<FileRefCreateInfo> create_info_array;
   FileRefCreateInfo create_info;
   create_info.file_system_type = PP_FILESYSTEMTYPE_EXTERNAL;
   create_info.display_name = "bar";
   create_info.browser_pending_host_resource_id = 12;
   create_info.renderer_pending_host_resource_id = 15;
   create_info_array.push_back(create_info);
-  ASSERT_TRUE(plugin_dispatcher()->OnMessageReceived(
-      PpapiPluginMsg_ResourceReply(reply_params,
-          PpapiPluginMsg_FileChooser_ShowReply(create_info_array))));
+  PluginMessageFilter::DispatchResourceReplyForTest(
+      reply_params, PpapiPluginMsg_FileChooser_ShowReply(create_info_array));
 
   // Should have populated our vector.
   ASSERT_EQ(1u, dest.size());
   LockingResourceReleaser dest_deletor(dest[0]);  // Ensure it's cleaned up.
 
   const PPB_FileRef_1_0* file_ref_iface = thunk::GetPPB_FileRef_1_0_Thunk();
   EXPECT_EQ(PP_FILESYSTEMTYPE_EXTERNAL,
             file_ref_iface->GetFileSystemType(dest[0]));
 
   PP_Var name_var(file_ref_iface->GetName(dest[0]));
@@ skipping 21 matching lines @@
   EXPECT_TRUE(CheckParseAcceptType(" app/txt , app/pdf ",
                                    "app/txt", "app/pdf"));
 
   // No dot or slash ones should be skipped.
   EXPECT_TRUE(CheckParseAcceptType("foo", NULL, NULL));
   EXPECT_TRUE(CheckParseAcceptType("foo,.txt", ".txt", NULL));
 }
 
 }  // namespace proxy
 }  // namespace ppapi